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EFFECT OF TEMPERATURE ON FATIGUE CRACK GROWTH IN THE POLYMER ABS
Author(s) -
Kim H. S.,
Wang X. M.,
Abdullah N. A. H. Nik
Publication year - 1994
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/j.1460-2695.1994.tb00236.x
Subject(s) - materials science , paris' law , composite material , polymer , crack closure , structural engineering , fracture mechanics , engineering
— Fatigue crack growth in a commercial grade ABS over the temperature range ‐ 50°C to 80°C has been studied. An Arrhenius type relationship between fatigue crack growth rate and absolute temperature was found to describe the experimental data. At Δ K = 1 MPa√m, the activation energy for crack growth in the temperature range −50°C to 19°C is 3.47 kJ/mole and in the temperature range 30°C to 80°C it is 19.63 kJ/mole. The two different activation energies were found to be associated with the roughness of the fracture surfaces. The roughness of the fracture surfaces is discussed in relation to modes of fatigue crack growth. In the low temperature range (− 50°C to 19°C) the fracture surfaces were found to be rather coarse, whereas in the high temperature range (30°C to 80°C) they were found to be somewhat smooth. These different roughnesses were deduced to be due to different modes of crack branching influenced by crazing. A “stress intensity factor”‐biased Arrhenius equation for fatigue crack growth successfully predicts growth rates at various temperatures.